TWRP Device tree for SM-A405FN
Use, build, modify at your own risk. I'm not responsible for anything you do to your device.
IMPORTANT! AT THE CURRENT STATE, THIS WILL RENDER YOUR DEVICE UNBOOTABLE! MAKE SURE YOU KNOW WHAT YOU ARE DOING BEFORE ATTEMPTING TO COMPILE AND FLASH THIS! It is possible to get back into the download mode to flash a stock recovery, but it is NOT an easy thing to do.
I have modified some files from this great repository: https://github.com/geiti94/android_device_samsung_a30dd
You will need a patched vbmeta.img. Do this with Magisk Manager. You will need a compile environment for TWRP images.
To build, clone the repository to devices/samsung/a40
source build/envsetup.sh
lunch "omni_a40"-eng
make clean
make -j* recoveryimage
Replace * with your CPU thread count. For me it would be make -j12 recoveryimage since I build on Ryzen 5 1600.